SU1254551A2 - Air-floated optical head - Google Patents

Abstract

The invention can be used in systems of contactless optical recording and playback of video and sound information. To improve the accuracy of positioning and focusing the optical beam on the information carrier, the convex surface of the moving head part 1 is made spherical with the center of the sphere on the axis in the main rear plane of the focusing lens 3, in which the axes of the nozzles 2 are located. By pressing compressed air to the working surface of the carrier 10, an air cushion is formed between them, providing the required working clearance. The compressed air leaving the nozzles 2 provides air lubrication between the surfaces of the movable 1 and the fixed 4 parts. The optical axis of the beam 11 of the light entering the lens 3 after refraction in the prism 6 constantly passes through the center of swing of the moving part 1 of the head. Invention - additional to auth. No. 1167650. 1 Il. ate 4 e ate m

Description

The invention relates to instrumentation and can be used in systems of contactless optical recording and playback of video information.

The purpose of the invention is to increase the accuracy of positioning and focusing the optical beam on the information carrier.

The drawing shows an embodiment of the proposed floating optical head.

The optical head comprises a movable part 1 with nozzles 2 and a lens 3, a fixed part 4 with an opening 5. a closed face of the prism 6, provided with an air duct 7.

The moving part 1 with the fixed part 4 is connected by springs 8 (in the case of the need to operate the head in two positions with a turn of 180)

The convex spherical surface of the movable part of the head is made up of a radius from a point on the axis of the lens located in the rear main plane.

The floating optical head operates as follows.

When compressed air is supplied to the duct 7, it enters the air chamber 9 and the movable part 1 of the head begins to move in the direction

Editor M. Petrov

Compiled by V. Sergeev

Tehred L. Serdyukova Proofreader L. Pilipenko

Order 4727/56 Circulation 543 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

five

to the working surface of the carrier 10. At the same time, the compressed air begins to flow out of conh 2, which provides air lubrication between the surfaces of the moving and stationary parts, and as the moving part approaches the surface of the carrier 10, an air cushion is formed, providing the required working gap.

The light beam 11 hits the reflective prism 6, it refracts and enters the objective 3, the optical axis of the light beam constantly passing through the center of swing of the moving part of the optical head, which allows high accuracy of positioning and focusing of the light beam to the information carrier.

Claims (1)

20 claims Optical head floating St. No. 1167650, distinguished by In order to increase the accuracy of positioning and focusing the light beam on the carrier, the convex surface of the moving part of the annular air chamber is made spherical with the center of the sphere on the axis in the main rear plane of the focusing lens, and the axis of the nozzles of the convex surface are in the rear main plane of the lens.